Question

Based on the equation, what could be the age of a person who has a target heart rate of 140 beats per minute?

Answer 1

I got `20` years

Explanation:

Let us use `y=140`:

`140=0.7(220-x)`

rearrange:

`220-x=140/0.7`

change sign and solve:

`x=220-140/0.7=20`